Tire Pressure & Airdown Calculator
Starting-point pressures for airing down by terrain, adjusted for tire size and vehicle weight. These are ranges to start from — the right pressure for your rig depends on tire construction, load, and what the ground is actually doing.
Your setup
Select terrain
Recommended starting pressure
All terrain reference
| Surface | Starting PSI | Range | Why | Risk if too low |
|---|
These are starting points, not absolutes
Tire pressure affects flotation, traction, sidewall flex, heat buildup, and bead retention. The right number depends on tire construction (bias ply vs radial, ply rating), tread pattern, sidewall stiffness, load, and speed. A 33" All-Terrain and a 33" Mud-Terrain have meaningfully different minimum safe pressures. Check with your tire manufacturer for their minimum aired-down recommendation.
Airing back up: After trail, air back to your highway placard pressure before driving at speed. Aired-down tires overheat rapidly on pavement. A CO2 inflator or portable compressor is not optional for airing down — always have a way to reinflate before driving highway.
Bead lock note: These pressures are for standard rims. If you're running bead locks you can go lower, but bead lock rings must be torqued properly before running very low pressures or you risk separating the ring under load.